Photographic shutter.



BEST AVAILABLE COP.

No. 844,854. PATENTED ,FEB. '19, 1907.

e. DIETZ.

PHOTOGRAPHIG SHUTTER.

APPLICATION FILED 161.53.21.1906.

ms NORRIS PETERS 60., wasumcrou. D c.

GUSTAV DIETZ, OF YONKERS, NEW YORK.

' PHOTOGRAPHIO SHUTTER.

Specification of Letters Patent.

Patented Feb. 19 1907. f

Application filed March 21, 1906. Serial No. 307,259-

To all whont it may c0n0ern:

Be it known that I, GUSTAV 'DIETZ, a citi-' zen of the United States, residing in Yonkers, in the county of Vstchester and State of New York, have invented certain new and useful Improvements in Photographic Shut-- ters, of which the following is a specification.

. This invention relates to an improved photographic shutter of that type in which a plurality of flies or wings is simultaneously operated by a suitable driving mechanism in such a manner that the making of instantaneous exposures is facilitated, an unimpeded motion of the flies produced, and flies of light yet durable construction are obtained; and for this purpose the invention consists of a photographic shutter in which a plurality of flies is pivoted to the driving mechanism and guided and turned around by means of stationary pins on the shutter-frame.

The invention consists, further, of a pliotographic shutter in which the-plurality of flies is pivoted to and oscillated with the drivingring in connection with stationary pins applied to the shutter case, said pins engaging slots in the flies which are located in the center line of the flies; and the invention consists, lastly, of the construction of the flies themselves, as will be fully set forth hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a front elevation of my improved photographic shutter with the front plate removed and showing the flies in closed position. Fig. 2 is a similar elevation showing" the flies in open position 'for time exposure. Fig. 3 is arr-enlarged transverse section on line 3 3, Fig. 2. Fig. 4 is a front'elevation showing the flies in position after exposure at the end. of their closing motion; and Fig. 5 is a vertical central section through one of the flies on line 5 5, Fig. 1.

Similar letters of reference indicate correspondingparts in the different figures of the drawings.

Referring to the drawings, f represents the ring-shaped case of a between-lens shutter, and cl the flies of the same. On a ringshaped shoulder r of the case is guided a driving-ring 1" by means of interposed antifriction balls or rollers 1' The driving-ring 7" is driven by any suitable mechanism, pref erably the mechanism shown in the application for a United States patent heretofore filed by me on December 22, 1905, Serial No. 292,989. The driving-ring 7" is provided with ners rounded off:

, ableniaterial, in which the'heads' ofithe' a four steel pivots d, which are arranged equidistantly from each other in a circle concentrio with the axis of the shutter-casasaid circle passing through the axes of said pivots. The pivot connection of the flies d wit the pivots d is located in the symmet center lines ofthe fiies.-. I

' In line with the symmetrical center line of the flies are arranged slots (1 which are also located in line with the axesof the pivots d and which are engaged by stationary pins d that are attached to the covering rear plate of the shutter-case. *The inner curved edges 'of'the flies form a circle when the flies are located in their intermediate po-" sition for time exposure, asshown'in'; Fig. 2,' while the outer contour of the flies'isapprpiii mately-that of an arc of a circle'con'cent I with the centers ofthe pivots withthe 91:

' The flies themselves arecOiis'truCtedQOf thin sheets of hard"rubber,'fwhich*arerein? forced by an elongated plate d?,"of"celluloid, which increases in thickness toward the holes in which the steel ivots (if are located, said plates being thic est at the portion around the :pivots." The =pivot -openingiiiii the flies isprovidedwitha bushing dj-of suit#,

ots d are located, the heads engaging ftlie bushings and turning"freely' in-"thefsain The reinforced 'fliesjcombine-great light'lie with'considerable durability. The 'fly'ni'o've; ment caused by the driving-ring is a coin go pound one; At the beginning of thefiymove ment the flies are started from their'clos'ed" position by the rotation of the "driving ring and moved first in'a nearly stra'ight dimtion conforming'to the circular'mbvenienttoff the driving-ring and center linesfiof th flies;

while the second partpfi thefl continuous movement isa= quick-turning movement or the flies producedby the retaining action of the stationary pins fastened to the plate of the shutter-case on the slotted'portions" of the flies, so as to produce while moving with the driving-ring a turning or throwing-over movement of the flies over the lens-opening, and the third part of the continuous movement of the flies,at the end of the motion of the driving-ring, is'again a nearly straightline' movement in the direction of the center line of the flies caused by the guiding of the flies on the stationary pins and the motion of the driving-ring. The fly movement causes the corresponding end portion of each fly to move from the center of the lens-opening for an exposure and then the closing of the lens opening by bringing the other ends of the flies to the center of the lens-opening in overlapping position with each other, as shown in Fig. A, so that the flies move from the closed starting position through an open pomechanism, acting by-means 01"- the drivingring on the flies, starts the movement of the flies around the lens-opening in the direction of the center line of the flies and in line with the} slots in the same, so that the contact- -,point of the driving force is placed on the strongest part of the flies. This starting movement permits of an acceleration of the driving movementfto full speed before the flies open, while-at the same time the throwing-over movement is gradually imparted to theflies'and-diminishes thereby the friction on the stationary pins by the resistance of which theflies are thrown over.

. .The...throWing-over movement of the flies islof, great speed and is caused by the passing of' the pivoted central portions of the flies with the. driving-ring over. .and'past the center-line of thelens-opening and stationary pins. Toward the end of themotion of the.

driving-ring. thestationary pins have completed the, throwing-over movement of the flies,. ,.and by stopping .the driving-ring the movement of the flies is arrested, thus relieving. the sidesof the guide' slots ofrall strain.

Lastly, the full ,leverageof; the :driving mecha'nismacts .onthe lower ends of the flies, which causes the uncoveringand re-covering ofthellens-opening,while the outer circumferential portions of the-flies are .moved very slowly in oppositedirection to the drivingring, -which .allows. the. full power .of the s ring to .be used for uncovering and closing t elem-opening. I

.jHaving thus described my invention, I

.. claimas newand desire to secure by Letters 1 Patent 1.' Inaphotographic shutter, the combination with. the-shutter-case, of. a drivingring guided therein, flies carried by said ring,-

. and means on said'shutter-case to-shift said flies successively to open and closed position during the movement of said driving-ring in, one. direction.

2. A photographic shutter comprising, in combination with the shutter-case, a drivingring guided in the latter, flies pivoted to said ring, and stationary-means on said shutter case to shift said flies continuously in one direction to make the exposure when said driving-ring is moved in either direction, said flies being rotated oppositely to said drivingring.

3. In a photographic shutter, the combination, with a shutter-case provided 'with a stationary guide-shoulder, of a"driving-ring guided on said shoulder, said driving-ring moving in: either direction during oneexposure, a plurality of flies pivoted to said ring and provided with slots, and stationary pins on the shutter-case entering said slots for imparting rotary movement. to saidfflies.

4. .In a photographic shutter, the combination ofa shutter-case,- a driving-ring'guided therein, flies pivoted to saiddrivingring and provided with slots, and stationaryqpins on said shutter-case entering said slots ,,and causing said flies to rotate continuously-in one direction during, the exposure when said driving-ring ismoved'in eitheridirection.

5. In-a photographic shutter,-fthef combination with a. driving-ring,; of- .flies; pivoted thereto and provided with slots, and-.stationary pins entering said slots, said flies heingin closed positionat either end ofthcirimove-f ment, but openZduring the intermediate :part of such movement.v I

6. In a photographic shutter;'iaifly consist-- ing ofa thin layenoflhard rubber, andia cen-. tral reinforcing layer -ofcelluloid. I

.. 7; In a photographim shutter, tasfly con- ;struoted otafthin layer of hardrubberyandia central reinforcing portion of celluloid,- said;

central portion having =a ;-pivot-opening and being made of increasing. thickness-toward said pivot-opening. I '8. In axphotographic shutter, afly constructed of a thin layer of hard rubber and areinforcing layer of celluloid, said reinforced portionhaving a pivot-opening and a slot in line with. the center line of the fly and the center of the pivot-opening.

In testimony thatI claim my invention 1- have signed my-name in presence of two subscribing witnesses.

"GUSTAVDIETZ.

I/Vitnesses: i

PAUL GoEPEL, HENRY J. SUHRBIER.

the foregoing. 

